To help you pick a couple of cordless loudspeakers, I am going to explain the term "signal-to-noise ratio" that is commonly utilized to depict the performance of wireless speakers.
As soon as you have selected a range of wireless speakers, it is time to explore some of the specifications in more detail to help you narrow down your search to one product. Each wireless speaker will generate a certain amount of hiss and hum. The signal-to-noise ratio will help quantify the level of noise generated by the speaker.
You can perform a straightforward assessment of the cordless speaker noise by short circuiting the transmitter input, setting the loudspeaker gain to maximum and listening to the speaker. You will hear some amount of hissing and/or hum coming from the speaker. This hiss is produced by the wireless speaker itself. Be certain that the volume of each set of wireless speakers is set to the same level. Otherwise you will not be able to objectively compare the level of noise between different models. The general rule is: the lower the amount of hiss which you hear the higher the noise performance.
If you favor a pair of wireless speakers with a small amount of hissing, you may look at the signal-to-noise ratio number of the spec sheet. Most producers are going to display this number. wireless loudspeakers with a high signal-to-noise ratio will output a low amount of static. Noise is produced due to several reasons. One factor is that today's wireless speakers all use elements like transistors and resistors. Those elements will generate some amount of noise. As the built-in power amp overall noise performance is mostly determined by the performance of components located at the amplifier input, producers are going to attempt to pick low-noise parts whilst developing the amplifier input stage of their wireless speakers.
The cordless broadcast itself also will cause static that is most noticable with models that employ FM transmission at 900 MHz. FM transmitters are extremely prone to cordless interference which is why newer types usually make use of digital audio broadcast. The signal-to-noise ratio of digital transmitters is dependent mostly on the kind of analog-to-digital converters and other parts that are used along with the resolution of the wireless protocol.
The majority of modern cordless speakers have built-in power amplifiers that incorporate a power switching stage which switches at a frequency around 500 kHz. This switching noise may result in a certain level of loudspeaker distortion yet is frequently not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
Producers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing may be achieved and by feeding a test tone to the transmitter that is generally 60 dB below the full scale of the loudspeaker amp. Next the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
Another convention in order to express the signal-to-noise ratio utilizes more subjective terms. These terms are "dBA" or "A weighted". You will find these terms in the majority of cordless loudspeaker specification sheets. In other words, this method tries to express how the noise is perceived by a human. Human hearing is most perceptive to signals around 1 kHz whereas signals under 50 Hz and above 14 kHz are barely heard. An A-weighted signal-to-noise ratio weighs the noise floor in accordance to the human hearing and is usually higher than the unweighted signal-to-noise ratio.
As soon as you have selected a range of wireless speakers, it is time to explore some of the specifications in more detail to help you narrow down your search to one product. Each wireless speaker will generate a certain amount of hiss and hum. The signal-to-noise ratio will help quantify the level of noise generated by the speaker.
You can perform a straightforward assessment of the cordless speaker noise by short circuiting the transmitter input, setting the loudspeaker gain to maximum and listening to the speaker. You will hear some amount of hissing and/or hum coming from the speaker. This hiss is produced by the wireless speaker itself. Be certain that the volume of each set of wireless speakers is set to the same level. Otherwise you will not be able to objectively compare the level of noise between different models. The general rule is: the lower the amount of hiss which you hear the higher the noise performance.
If you favor a pair of wireless speakers with a small amount of hissing, you may look at the signal-to-noise ratio number of the spec sheet. Most producers are going to display this number. wireless loudspeakers with a high signal-to-noise ratio will output a low amount of static. Noise is produced due to several reasons. One factor is that today's wireless speakers all use elements like transistors and resistors. Those elements will generate some amount of noise. As the built-in power amp overall noise performance is mostly determined by the performance of components located at the amplifier input, producers are going to attempt to pick low-noise parts whilst developing the amplifier input stage of their wireless speakers.
The cordless broadcast itself also will cause static that is most noticable with models that employ FM transmission at 900 MHz. FM transmitters are extremely prone to cordless interference which is why newer types usually make use of digital audio broadcast. The signal-to-noise ratio of digital transmitters is dependent mostly on the kind of analog-to-digital converters and other parts that are used along with the resolution of the wireless protocol.
The majority of modern cordless speakers have built-in power amplifiers that incorporate a power switching stage which switches at a frequency around 500 kHz. This switching noise may result in a certain level of loudspeaker distortion yet is frequently not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
Producers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing may be achieved and by feeding a test tone to the transmitter that is generally 60 dB below the full scale of the loudspeaker amp. Next the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
Another convention in order to express the signal-to-noise ratio utilizes more subjective terms. These terms are "dBA" or "A weighted". You will find these terms in the majority of cordless loudspeaker specification sheets. In other words, this method tries to express how the noise is perceived by a human. Human hearing is most perceptive to signals around 1 kHz whereas signals under 50 Hz and above 14 kHz are barely heard. An A-weighted signal-to-noise ratio weighs the noise floor in accordance to the human hearing and is usually higher than the unweighted signal-to-noise ratio.
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